ruby modbus_tablas.rb
/home/pablo/.rvm/gems/ruby-1.9.3-p374/gems/rmodbus-1.1.5/lib/rmodbus/tcp_slave.rb:53:in `read_pdu': Transaction number mismatch (ModBus::Errors::ModBusException)
	from /home/pablo/.rvm/gems/ruby-1.9.3-p374/gems/rmodbus-1.1.5/lib/rmodbus/slave.rb:248:in `block in query'
	from /home/pablo/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
	from /home/pablo/.rvm/rubies/ruby-1.9.3-p374/lib/ruby/1.9.1/timeout.rb:99:in `timeout'
	from /home/pablo/.rvm/gems/ruby-1.9.3-p374/gems/rmodbus-1.1.5/lib/rmodbus/slave.rb:246:in `query'
	from /home/pablo/.rvm/gems/ruby-1.9.3-p374/gems/rmodbus-1.1.5/lib/rmodbus/slave.rb:59:in `read_coils'
	from modbus_tablas.rb:13:in `block (2 levels) in <main>'
	from /home/pablo/.rvm/gems/ruby-1.9.3-p374/gems/rmodbus-1.1.5/lib/rmodbus/client.rb:69:in `with_slave'
	from modbus_tablas.rb:12:in `block in <main>'
	from /home/pablo/.rvm/gems/ruby-1.9.3-p374/gems/rmodbus-1.1.5/lib/rmodbus/client.rb:40:in `initialize'
	from modbus_tablas.rb:11:in `new'
	from modbus_tablas.rb:11:in `<main>'